Light projector



Oct. 28, 1930. R. c. ANGELL 1,779,997

LIGHT rriogmc'roa Original Filed May 24, 1926 2 Sheets-Sheet l 100 awuanto'o Oct 28, 1930.

R. C. ANGELL LIGHT PROJECTOR Original Filed May 24, 1926 2 Sheets-Sheet 2 fioberf (t Au /e11,

avwemtot Patented Oct. 28. 1930 U TED, STATES Parent 1 mm DENTAL MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA QIGHT'PROJECTOR i Application medmw 24,192asena1 No. 111,167. Renewed May 23, 1930.;

"My invention relates particularly to light projectors that are adapited for the use of professional operators, such as dentists, surgeons',ortechnicians,and is especially directed to that class of such devices as are designed to project an intensified pencil ray and" to localize the illumination upon a regionto be inspected or operated upon.

The principal objects of my invention are 'toprovide, a light projector that may be e00 .nomically" formed and readily assembled, a and that may be conveniently utilized without dangernof unduly heating, and conse 'quently. be safely and comfortably handled.

Other objects offmy invention are to provide'a lightprojector provided with aconveniently disposedauxiliary win'dow having' an adjustable shutter, for purposes not requiring an intensified'pencil ray, as, for .instance, the illumination of X-ray films 1 Further objects ofmy invention include a .removable iattachment, :which cooperates with'ithe light concentrating lenses for prof-ducing the intensified pencil ray, and, which includes color screens for absorbing the eX-' cess color rays of the lamp bulblto produce a PH lYdaYl p My invent on also includes a novel 0011-,

struction of lamp"body' and lens ,tube,-where- "by counterpart halvesfof the" '1a1np -body' structure and the lens-tube structure may be r assembled in interlocked relation to form the composite light-projectorstructure; I

Specifically stated, the form of my invjention 'asliereinafter described, comprehends a light'projeetor comprising a lamp housing ,iormedfof readily joined counterpart sections, l a r lensecarryingfltube or barrel also formed of counterpart sections, and lamp mounting upon which-said. lamp housing and lens tube are mounted forrotation aboutthe 'aXis. of-'1 the lamp mounted-on said lamp mounting, all beingfformed cf non-lieat-com ducting material, and includes heat-deflecting and light-reflecting shield "embracing said lamp and concentrically" spaced from thehousing wall to afford ample'fspace for p the. circulation. of :air between 'said'housing wall and said shieldge window tor illumi -f natinggphotographic films and having a ten intensified daylight pencil ray.

My'invention also includes all of the vari- 'ous novel features of construction and'arrangement as hereinafter more definitely In the accompanying drawings, Figure '1 ,is a central vertical longitudinalsectional onner-7o. ANGELL, or PRINCE BAY, NEW roan. ASSIGNOBEQ THE s. s. WHITE] view of a light projectorembodying the characteristic features of my invention ,Fig. 2 is an inverted plan view of theupper section of thelamp housing as viewed toward the inclined plane indicated on the line 2-2 in Fig. 1; Fig. 3 is a plan view of the lower section of said housing as viewed on the inclined plane indicated'by the line 3.3 in. Fig. 1; Fig. 4 is a'transverse sectional view taken in the plane indicated by [the line H in Fig. 1, and showing the inner end-of the lens tube or barrel Fig. 5 is a centraltransverse sectional view takenthrougli the lamp housing and light-reflecting shield on. the

line 55 inFig'. 1', only fragments of saidshield being shown "forconvenienceoi' illustratlon; Fig. 6 1s a sectional view taken transversely throughthe lens tube or barrel ontheline '6-6in Fig. 1; ig.7 is a perspective view of one of the counterpart sections of the lenstube or; barrel; Fig. 8 is a side elevational view of the light reflecting and In said figures, the lightprojectorcoin:

.heatgdeflectinglshield;.and Fig. 9 is a per spective view of the lens-tube cap which I serves asa holder for the daylight screens. f

prising the'lamp mounting 1,1amphousing 2, and lens-carrying tube 3,is arranged tobe supported by any suitable form of light bracket arm, preferably; having universal joints adapted to permit the light projector to be moved into anydesired position;

The lamp mounting comprising the hollow j body 5, preferablyfformedfof asynthetic umor henolic condensationnroduct is'ca r riedbyvthe tubular extension 6 which maybe :fo'rme'd' ofmetal and which has the end mem:

ber7 terminatingin the hollow disk 9 having bppositely directed bosses l-Q' and ll for 1.00

connection with the terminal of any suitable and well known form of bracket arm.

The hollow extension 6 serves as a housing for the electrical switch 12, having the onand-off controlling buttons 13 and 14 respectivelyior controlling the electrical connections comprising thelead wires leading elec tric current to the lamp.

Within the bore of the hollow body is disposed'intelescopic relation, the tubular lampmouriting sleeve 15, which is adjustably secured therein by the screw 16 projecting through slots 17 and 18 in the hollow body 5 and in the upper enlarged portion of the hollow extension 6 -respe( :tively. I

W'ithin the lamp-mounting sleeve is mounted the lamp-mounting cup 20, which is provided with oppositely disposed bayonet slots 21, and has the extension 22 to which the'electrical lead wire 23 is attached. The extension 22-is connected with the spacing bar 25, which is disposed in the slot 26 in the lamp-mounting sleeve 15, and abuts against the end wall 27 ofsaid slot to prevent the upward or outward displacement of the lampmmmting cup from its annular seat formed by the shoulder 28.

The electric lamp 30 which. is of the type "used tor automobile illumination, has the cylindrical shank 31 provided with the oppositely disposedradially extended catch pins 32,.andis mounted in the lamp-mounting cup 20 with said pins 32 engaged with the bayonet slots 21 in-a well known manner, and its contact 33engaging the contact plug or plunger .35 which is mounted for reciprocation 'throughthe fiber plate 36 forming the bottom wall of thelamp-mounting cup 26and which is connected by the lead wire 34 through the switch 12. 7

Said plunger 35 is provided with a fiber disk collar 37 between which and the fiber plate 36 is disposed a spiral spring 39 encircling saidplunger 35 and arranged to force it outwardly against the contact 33'of the lamp 30, but arranged to yield topermit the lamp to be engaged with the bayonet catch comprising the bayonet slots 21 and pins 32. The lamp'housing 2 ispreferably formed of nOn-heat-conducting material such as a phenolic condensation product and comprises 'ebunt'erpart sections referably in the form semi-spherical she ls 40, each comprising sent holes 41, 42 andf43, and threaded aper- "Utlres 44 surroimded by internalbosses 45, and withdrawing apertures 46, the walls of which 'lweiidented ?to form notches 47in the margin of=the shellAO contiguous to said apertareld' t' I The plane edges of said semi-spherical shells are eachiprovided with the semicylindricakrecessesm, 51, 52 and 53, so disposed that whensaidedges are brought together in abutted relation to form the 1amp,housin'g trlmture, these semicylindrical re will said .:shells 40 into proper registry to form the spherical lamp housing 2.

The lower section of the lamp-housing structure is conveniently mounted upon the peripheral ledge of the hollow body 5 with the boss 66extended through the aperture 46 so that the housing may rotate about the axis of the hollow body 5 and lamp 30, being retained for such rotation on the hollow body 5 by the annular plate 67 having the flange 68 arranged to bear against the inner wall of the shell40, as shown in Fig. 1; said plate 67 is secured to the hollow body 5 by screws 69 and may be adjusted by said screws to bring the flange 68 to bear with any desired frictional engagement with the inner wall of the lower shell 40 of the lamp housing.

Within the'lamp housing 2, a light-reflecting and heat-deflecting shield 70 is concentricall mounted and com rises the spherical body 2 having three su stantially equally spaced openings therein respectively surrounded by the cylindrical flanges 73, 74 and 75,'whoseaxes are preferably disposed in a. common plane, the latter flange'being provided with longitudinally directed slits 76 extended inwardlyfrom-its outer edge 80 that itmay be contracted to receive the cap 77, comprising the preferably ground or frosted crystal 78' and flange :7 9, which latter is arranged to embrace the slitted flange of the shield 70, as shown in -F' 1; said cap 77 having its outer peripheral e ge seated in. the rabbeted opening formed by the complementary v recesses 55 in the abutted shells 40.. I

, The light-reflectin shield 70 is provided uponits-opposite si es with, axially alined bushings 80 having threaded apertures 81 which are disposed in axial alinement with apertures 82 and ,8 3 in the lugs 60 and61 respectivel through which screws 85 extend, having t einshanks extended through said apertures 82 and 83 in; threaded engagement with thethreaded aperture 81 in the bush- 80 of the l' ht-reflecting shield 70, the heads 86 of said countersunk recesses 87 in the outer walls of the lugs :60. V

a It will thus be seen that the counterpart sections comprising the shells 40 of the lamp Z2 iare'iintegrally joined with the screws being disposed in light-reflecting and heat-deflecting shield by said screws 85, and consequently the structure thus formedmay be readily disassembled,

.for the replacement of the lamp or forfthe' cleaning of the interior'cparts within the by the mere removal of saidlamp housing, screws. V-

As shown in Fig 1, the'opening formed :bytherecesses 55 serves as a window, and is provided with a/shutter 89 of. any desired contour, but conforming to the spherical outer surface of the'lamp housing. 2, and said shutter is pivoted on the stud 90, having the threaded shank 91 in threaded engagement with the threaded aperture 44;, and having ,t-hehead- 92 arranged to retain the shutter 89 in pivoted engagement with the lamp housing 2. I Said shutter may be rotated upon the stud 90 to open and close comprising the window, formed by the recesses 55, but is normally retained in its closed position by. the tip93 ofthe stu'd94c, which is in threaded engagement with the threaded aperture' le in the lower shell 40 of the lamp housing 2, saidtip being arrangedto engage the slotted recesses 95 in'the inner face of the lower or free extremity ofsaid shutter 89.

It will be obvious that the window which is covered'by the shutter 89 may be opened for various purposes, such, for instance, as the reading of 'X-ray films, or for any other purpose that may be desired for light that is not in the form of a lensed pencil ray.

The lens tube 3 isformed by thecounterpart substantially semicylindricalhollow sec-' tions 100, such as is shown in perspective in Fig.7, which are arranged to be joined by i assembling two OfSIlCh sections with their aperture 46in the upper section or shell of the lamp housing, and which is provided with radially extended lugs 106, as shown in' Fig; 4,-which lugs may be registered with the in- ,dentationsor notches47, and thrust there through, andby the rotation of the lens tube 3,rsaid lugs 106 may be shifted into position behind the margins of, the shell encircling the aperture 46, whereby thejlens tube may tube, but the counterpart sections ofwhich the lens tube is composed may be'also held together.

I The boss 104 on the lens-tube sections has a reduced inner termination 109, which is the opening 1 the lens 120.

arranged'toenterr the flange 73 to insure:

proper registry ofthe light-reflectingshield with the axis of sa-id ;lens tube. The substantially 'semicylindrical bore of the .lenstube sections 100 terminates at its inner end with a semiannular recess 110, having, the plane inner wall 111 against which the flat inner side 112 of the lens 113 may engage, the outer curved side 114 of the lens 113 having its margin engaged, against the angular wall I ofsaidrecess 110. I i

' From the planewall 111- of the recess 110,

inthelens-tube sections,the conical wall 115 ofthe bore converges rearwardly into the restricted orifice'll6 concentric with the axis [of the lens tube 3 and lamp 30. Theouter {extremityof the lens-tube sections are re ,duced to form the threaded nipple 117,-and the inner edge of the outer endof theb-ore of said sections 1 00 .isra-bbeted to form the annular groove 119, arranged to receive the 'peripheral marginof the outer lens 120,

which maybe held in position bycthe internally threaded collar 121 which isin threadedeng'agement with the threads of the nipple and; has the flange 122 arranged, to engage .the outer peripheral edge margin .of

The free. outer end of the lens, tuber '3 is arranged to removably receive the daylight attachment comprising the cap 125, having a in itscylindrical wall a ;reduced neck 126 I forming a shoulder 127 between whicheand theinturned flange 128, thedaylight screens c129: and 130 are arranged Ito be "engaged, Said cylindrical wan is provided with suitably spaced vU-sha'ped .cuts 132 arranged, to form the spring tongues 133 having the inwardlypressed projections: forming teats 135 which. are ,arrangedltoi enter the annular groove 136in the collar-i121 to yieldingly and 'removably retainsaid daylight screen .hold- V in'gcfap on said tube in such position that said daylight screensfcooperate with the; lenses 113' and 120' to' project a daylight pencil ray; 5 Itima'y I be, here noted that; althoughflthe" counterpart sections of the lenstu'be are fir'm 7,

1y held togetherby their en agement withthe 'lampshou'sing sectiontland by'thecolla'rl21, said sections. maylfbe conveniently; cemented together,andthelens tube maybe 'alsofpe mented to the housing secti nA O toILaflOrd an integralstructure. v

invention isadvantageous in I only provides the lamp housing of a light projector with a shield for the deflection of the heat, generated "fromifthe lamp within said 7 lamphousing,'jbutfthe lamp housingplens heat-conducting material so that the exterior tube,and lamp mountingare'forniedof a'nqnnot only be held together withthe housing: A r

of thelightprojectoristructurewhich is han-' dledif by the, operator cannot becomefuncomfortably heated as "has beenfoundto be the I nezam a iq amprliousi s J I,

5 heatefiecting and I do not desire to limit my invention tothe precise details of construction and arrangement as herein set forth, as it is obvious that various modifications may be madetherein without departing from the essential features of my invention as defined in the appended claims.

Having thusdescribed my invention, I claim: 1

1. A 1i ht projector comprising" a lamp housing ormed of a non-heat-conducting material comprising separablejsections, and having means arranged to support a lamp therein, and a concentrically disposed heatdeflec'ting and light-reflecting shield within said housing spaced from the Walls thereof, and means extended through said sections in engagement 'with said shield arranged to secure the structure together.

2. id light projector having a counterpart sections having interengag'ing recesses and projections for maintaining the opposed edges of said lens-tube sections in regist 1 37A light projector comprising a lamp housing and lens tube, each comprising counterpart axially divided sections separately joined and respectively provided with interengaging and interlocking means whereby said housing and lens tube maybe readily joined together. i

In Witness whereof, I have hereunto set my hand this 21st da of May, A. D. 1926. RO ERT C. ANGELL.

lamp han ing formed of non-heat-conducting material, and I comprising separable parts having overlapping projections, means arranged to'support a lam therein, and a concentrically disposed light-reflecting shield to which said separable within said housin ed to form a composite parts may be attac light projecting structure, and means extended through said projections arranged to secure said separable parts and said shield I I together. 7 r

3. A light projector comprising a lamp housing and'l'ens tube, each comprising coun terpart sections separatelyjoined and provided withinterenga'ging and interlocking means whereby said housing andlens tube may be p readily joined together. i

v 4. In a lightiprojector, the combination with a base nr'ember ar'ranged to support a lamp, of a lamp housing comprising countera part sections provided with notched apertures and having overlapping projections and corresponding recesses forming guides for-effecting registry of said counterpart sections, means arranged to detachably secure said sections together, a lensscarrying tube havin l Larra d to be thrust through one o s di d'notcli' fi apertures in said lamp housing and be rotated to engage said lugs behind the margins of said aperture intermediate of the I I notches. 1 j I 5. In a light projector, the a combination with a basemember arranged to support a lamp, of a lamp housing comprising counterpart sections provided with notched apertures and having overlapping projections and corresponding recesses forming guides for effecting re i lamp said sections may be secured, a lens-carrying tube having lugs arranged to be thrust of said counterpart sections, a 7, serv ng as a reflector.to which throughone of said notched aertures in said lamp housing and be rotate toengage said lugs behind the notched margins of said apertures, said lens tube being formed of its 

